Class 11

Those who opt for the astronomy field, should pass their plus two examination under the science stream, specially in physics and math's. For pursuing a career in theoretical or observational astronomy one may go through the science stream after plus two. Since universities offering undergraduate programme in Astronomy are rarely found, one can join for a major/ honours in Physics with Mathematics as a subsidiary subject. Thereafter, take a master's degree in Physics or Astronomy. After the successful completion of M.Sc, one can do specialization in astronomy leading to Ph. D. which enables one to become an astronomer/ astronaut/ astrophysicist or a scientist/ research officer etc. in the field of space research.
The Physics Aptitude Test (PAT) is a 2-hour subject-specific admissions test for applicants to the University of Oxford for undergraduate degree courses in Engineering, Materials Science and Physics undergraduate degree courses.
The PAT is held pre-interview stage at the beginning of November. Test results are not published automatically, but candidates may request their test score as part of the usual University of Oxford feedback process.

You can join Film and Television Institute of India (FTII) after graduation to learn acting. You can join NSD after completing 10+2. You can also join any private acting school to learn acting.
FTII is an autonomous institute under the Ministry of Information and Broadcasting of the Government of India and aided by the Central Government of India. It is situated on the premises of the erstwhile Prabhat Film Company in Pune. Since its inception in 1960, FTII has become India's premier film and television institute with its alumni becoming technicians, actors and directors in the film and television industry. You are advised to evaluate joining FTII-Pune to become an actor. It offers two years postgraduate Diploma in Acting. Any Bachelor's degree holder is eligible to seek admission in the course. There are total 10 seats for every course.
National School of Drama (NSD) is a theatre training institute situated at New Delhi, India. It is an autonomous organization under Ministry of Culture, Government of India. NSD provides a three-year full-time Diploma course for entrants intending to make theatre their profession. Lots of film & TV actors are alumni of NSD.